This whole thread sounds like you're trying to talk yourself out of needing help. Your therapist suggested IOP. You've not even started, yet you're listing reasons for wanting to drop out the day you start if you do.

Regarding a shortened/less intensive version with the same content, the answer is no, there isn't. Or what you're doing now with therapy could be considered it. There's a reason it's called Intensive; because it is intensive. There's a reason it's called partial hospitalization, because it's hospitalization.

If you're thinking and talking about suicide, then your therapist has every right and responsibility to be seriously concerned.